Paper, printing and gunpowder Will head from east to west,
纸 印刷术和火药 从东方传入西方
All keys to the future of mankind.
是打开人类未来之门的钥匙
But at the same time, a killer is on the loose,
但与此同时 一个致命的杀手还逍遥法外
That'll wipe out up to half of Europe's population.
它将夺去欧洲约一半人的生命
Mankind battles an enduring enemy: disease.
它就是人类永远的敌人: 疾病
Issyk kul, a trading post, midway between Europe and Asia.
伊塞克湖 是亚欧途中的一个商栈
Genghis Khan has been dead for more than a century,
成吉思汗一个多世纪前就已去世
But his empire continues.Along its trade routes, a deadly traveler.Bacteria.
但他的王朝还在延续 在这条贸易商路上 还有一位致命行者 细菌
For three and a half billion years,Virtually every corner of the earth has been covered By these micro-organisms.
35亿年间 这些微生物几乎覆盖了 地球上每一个角落
Our own bodies contain more bacterial cells Than human cells.
我们体内的菌细胞数量 甚至超过了人类细胞数量
Most are harmless,many are essential,But these have the power to kill.
大部分菌细胞是无害的 许多甚至是必不可少的 但这些细菌却带有致命的杀伤力